Adjustable umbrella stand



FIG. 1 is a top-front perspective view of the adjustable umbrella stand of the present invention;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for an adjustable umbrella stand, as shown. 